Telephone system.



H. L. HARRIS.

TELEPHONE SYSTEM.

APPLICATION 111.51) AUG.2. 1911.

Patented Nov. 23, 1915.

L Wifnesses lnvenfor' L Ha rr'is COLUMBIA PLANDGRAPH co.,WAsH|NuTON.01c.

I phone of such attendant Elyria; in the county ofLorainandState'tendant about theoflice.

"inure s t 'NTKEPFTGE.

GARFORD MANUFACTURING COMPANY, OF

ELYRIA, OHIO,'A oonnonnmr on or onion 'TELEE IHONE SYSTEM arcie.

Specification. of Letters Patent;

Patented Nova2i3, 1915 e Application fil'ecl August 2, 1911. Serial No.641,903.

To aZZ whom it may concern Be it known that L HARvnY L.'.-HARRIS," acitizen of the United States, residing fatof Ohio, have invented certainnew and useful Improvements in 1 Telephone Systems; and I do herebydeclare the follovvingto hey a full, clear, and exact description of myinvention, such as Will enable others skilled in the art to Which itappertains'to inake and use-the sarne- This invention relates totelephone systems, and more particularly to, What jfi's known asprivate" branch exchange systems;- though I contemplate employingmyinvention upon other exchange systemswhere yit maybe conveniently used.

At times the service of the operator at 1 3 telephone exchangeor atr asection of a telephone exchange *may be dispensed withand the callsreceived at that board or 'tliat part'of the board attended-to'by someother person, such as another operator or an*at+ Thishappens at certairrhours during the dayoi ni'ght at I nearly every private branch eXchangefinservice in tl1is=c0untry- For example, in hotels'during the nighthoursythe opera tor is oiincluty an clthe hotel clerk or=so1neotherattendant i must answer the calls: As the switchboard: i'rnay belocated" so1ne dis-- tance vfrom the desk orwother place where J/ theclerk or attendant is norinally einployech it will .saveconsiderableltime and troubleif thesecalls can be answered 'from thetele 7 Oneof thexobjects of rny invention is to providea system, suchthat the attendant or" 1 anotheroperator/may answer the calls fro1n hisown itelephonekwithout: having to. go to the board and there answerithe: calls! a Other objects of my invention and theli'n venti on itselfyWillfi be best understood by referringwto the followingtdescriptionlandn the drawing accompanying the: same; which: when taken atogetherillustrate: specific em 1v bodiments of the invention, l while th'escope of the invention itself,- vvill be more particu larly pointedout'in the appended claimsuv Figure 1 is a diagram of one forniof myinvention. Fig.1 21 shows a modificationn Referring now to the drawingand to thew embodiment-10f.myiinvention i shown therein an I showa"centrahstation here illus trat'e-d asia private branch exchangesystems and at B and C substation circuitsx number of-substations may be-connected to the private branch exchange system, I hav ing showvnbuttwo here, aS tWO aresu-flicient 1 to "illustrate-my invention; theobjectsand theoperation thereof. The stationB is connected'by conductors1 and2 toa 'jaclrJ- at the exchangeand the-substationC/ by con ductors 3ends to a'ja'ck J at the exchangeu The springs-'5 and 6 of the jacksnormallyrest iagainst contacts? and S Whi ch may be connected 'byconductors 8 and- 9' to thie common conductors l0 and 11. I These conductorsar'e normal-1y grounded through the 1 contactsf 12-'13'1%+1-5 ofa relay Rl 'l hevo circuit "of? "the relay R P is" "controlled by arelay- R which is connected; to a pl-11 g? byconol uctors l6 and: Thelin e relays are shownat and CR The line lamps are shownatiLland- Lw i Qisanalarmbell controlled by arelay R Whichf is in -turn-controlled bythe line re-* lay-3A; source of current i's shovvnatX: The objects ofrnyinvention and the apparatus iernploye'd in"- thefspecific embodiment,A illustrated andits functions will" be best understood f om adescription Of the operation; which is I as follows? VVh'eIrtheyoperatowat the exchan ge or at a' section of the exchange, "desires toleave her posi tion,-* the plug Pisinser ted' into the jack of oneof thesubscribers lines; whichhappel s to the" calls "coining in at the board7 or at that section of the board during the absence 05590 the operator;I The tip '20 connectecl ivith* the --stra-'1'1cl-- 17, en gages the jack spring 5; opening the switcli 57 and the" sleeve 211,-" ofthe'strand 16, engages spring 6 of the jacln opening the"switch 6 8and'cutting'95 the' line 1+2, (which for th'e 'sake of clear ness we vvillcal-l the attendantsl line) oiif from the connnonconductors 10*"and 11Now' should 'a call come in, for' ex'arnpl'e, from-the party atthestation C, the receiver hook22 at the station irising whentheireceiver is 1 removed" therefrom, engages the contact23,-co1npleting "the following circuit: 238-5 7- 10 12'13 f to ground at(1r,'th'rough the ground to the grounded pole of ba ttery X, through battery X%condu ctor 24 conductor '25 -relay R "8 +6"4, transmitter T tothe contact" 22, thus completing the circuit. The relay It, isenergized, pulling up its armature 26, closing the switch 2627 andcompleting the circuitlthroughthe lamp L and I relay R as follows:ground G. ,.14L 92627-6-828LR the conductor 29armature 30contact 312lbat tery X to ground at G thus completing a circuit through thesemembers. L is actuated while the relay R is energized, pulling up itsarmature 31 and clos ring a switch 31 32, which completes :a

; In the form shown in Fig." 2, the

circuit from the bell Q as follows: ground G;Q,conductor 353231 -2tX toground at G operating the bell. be apparent that any suitable indicatormay be employed inthe place of the lamp or the bell and such indicatormay be located at attention of the attendant being attracted anyconvenient position, such for example,

at the position of another operator, at the clerks desk or in anotherapartment. The

by the indicator, the receiver V at substation B is takenfI'OlllotllQ-llOOk 40, which rising engages the contact 41, completingthe following circuit through the relay,R,:

-grounded pole of battery X-Winding4e2 transmitter T 2-6 21- 16 to theother winding 43 and theother pole of the bat tery X; The relay Risenergized,'attract- ;ing its armature 44 and closing the switch Thiscompletes a circuit through the relay R as follows: G Xt6 1445R togroundat G The relay R is energized, pulling up its armatures 12 and 14,cutting the conductors 10. and 11 off from ground,

connecting them through the armatures l2 and 1 1 with the contacts 50and 51 and the conductors 16 and 17 and completing the circuit betweenthe substationB andC as follows: from the switch hook contact 11.

357-8 10*12 5O 162162' Current is. supplied to this circuit from thebattery; X through the Winding 42 and 13, the battery being thusbridge-d across the talking line.

T 10, completing the circuit.

Conversation is carried on over this circuit. When terminated, thereceiver V is restored to the switch-hook 40 which opens the circuit at.4041. This interrupts the circuit of the relay R previously tracedthrough this switch. The relay R is accordingly deenergized, whichbreaks the circuit through the relay R at 4H5,

so that the system is restored to normal. When the relay R is energized,the indicators which receive current through the' switch 14t15 areretired.

attendants substation. is illustrated at B. Here the line l'2 isconnected to the conductors 16 and 17 by a switch operated by a key orThe lamp It will some other suitable means which is substituted for theplug P. This switch isshown at 1V;

While I have shown these particular i forms of my invention, I do notWISh-t O be limited thereto, as it will be obvious to'those skilled inthe art that numerous and extensive departures from the forms anddetails of the apparatus shown therein,-

may be made without departing from the spirit of my invention, theseforms being shown solely for the purpose of clearly illustratingspecific embodiments of the in- Vention. I Havingthus described andillustrated my invention, what I desire to claim is:

1. In a telephone exchange system, the

combination of a, plurality of telephonelines, substations connectedupon said lines,

a central station and means whereby the substations may callthe centralstation, a V plurality of conductors common to said tele-. phone lines,connective means, including a,

plug and jack switch,'at the central oflice to designate one of saidsubstationsas an attendant station, a relay device associated u I withvsaid connective means, a'relay devicel associated with each otthe saidtelephone central oflice to which the lines lead, means t at thecentralofli'ce to connect the lines to:

gether, a selective circuit at the central oiiice under the control ofthe operators to. select one of the telephone, lines asan at-o"tendantline, a relay in said selective circuit, relay mechanismassociated with each of the telephone lines,fa plurality, of commonconductors, eachof said relay mecha-V nismsadapted to connect itsassociated tele-.

phone line to the common conductors to establish a conversationalcircuit between the tendant station, said relay device and the relaymechanism of the calling line adapted circuit.

3. In a telephone exchange switchboard,

connection terminals associated therewith,

telephone lines containing sub-stations, said telephone lines beingconnected to said con- 1 line with which it is associated and theat' tojointly disestablish such conversational.

nection terminals, circuit conductors common to the telephone lines, arelay device as sociated with each of the said connection terminalsadapted when operated by the connected sub-station apparatus to connectits associated. telephone line to saidcircuit conductors, selectivemeans under the control of the operator at the switchboard for selectingone of the telephone lines, a relay device adapted to be operated by theapparatus at the sub-station of the selected telephone line forconnecting said selective means to said circuit conductors, said lastnamed relay device being thereafter under the control of theinterconnected sub-stations to disconnect said sub-stations.

4;. In a telephone system, the combination of a plurality of telephonelines, sub-stations thereat, a switch-hook at each of the substations,switchboard jacks at a central office for said telephone lines,conductors common to said telephone lines, a relay device operated bythe switch-hook at the sub-station for connecting its associatedtelephone line with said conductors, a second relay device associatedwith the telephone lines for operating an alarm signal, a relayassociated with said trunk circuit, a selective circuit including a plugswitch, said plugswitch adapted to be inserted in one of the switchboardjacks to select an attendant station, an electromagnet associated withsaid selective circuit to operate said relay when the switch-hook at theattendant station is operated, to connect said attendant station to saidtrunkcircuit and to disconnect said alarm signal. I

5. In a telephone system, a main station a plurality of substations,telephone lines leading from the substations, to the main station, aline relay and a line signal controlled thereby associated with eachtelephone line, a plurality of commonconductors, a circuit under thecontrolof the line relay for connecting its associate telephone linewith'the common conductors, a source of current, other conductorsconnected with the source of current, switching mechanism associatedwith said other con ductors, including a manual switch and a relaydevice, said manual switch adapted to connect one of said substationsdesignated an attendant station with said other conductors, said relaydevice being controlled by said attendant substation set and adaptedwhen operated to connect said common conductors with said otherconductor.

ing said lines together, an attendants sub station normally disconnectedfrom said means, means under control of said attendant for connectingthe attendant substation to said firstnamed means, said last named meansbeing partially under the control of a calling subscriber.

7 In a telephone system, the combination of a plurality of substations,an exchange station, telephone lines connecting said substations andsaid exchange station, said substation lines being normally connectedtogether at the exchange station, an attendants station, a telephoneline connecting said attendants station to said central station, saidattendants line being normally disconnected from said substation linesand means controlled by the apparatus at the attendants station forconnecting said attendants line to a calling line, said means beingthereafter jointly controlled by the attendant at the substation and acalling subscriber for disconnecting the aforesaid lines.

'8. In a telephone system, the combination of a plurality ofsubstations, an exchange station, a plurality of telephone linesconnecting said exchange station to said substations, an attendantssubstation, an attendants line connecting said attendants substation tosaid exchange station, said substation lines being normally connectedtogether, means to disconnect one of said stations from such commonconnection and means to connect such disconnected substation in circuitwith a source of current and a calling substation.

In testimony whereof, I aflix my signature in the presence of twowitnesses.

F. O. RICHEY, A. D. T. LIBBY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. O.

